Sawmill setwork



" June 21,1927, 1,633,206

T. CARMICHAEL. ET AL SAWMILL SET WORK Filed March 29. 1926 2 Sheets-Sheet 1 INVENTO RS' fi/anms CARM/CHAL'L JOHN f. 50 WL/N ATTORNEYS.

' 1,633 06 June 1927' T. CARMICHAEL ET AL SAWMILL SET WORK Filed March 29, 1926 2 Sheets-Sheet 2 iii) Patented June a 21, 1927.

UNITED STATES THOMAS CARMICHAEL AND JOHN E. BOWLIN, OF FORT 'IBRAGG, CALIFORNIA.

SAWMILL SETWOBK.

Application filedMarch 29 This invention relates to improvements in set works for use in connection with saw mill carriages in adjusting the knees or head blocks for predetermined distances toward or away from the saw blade.

The general object of the invention is to provide an apparatus of simple .construc' tion and requiring but a minimum of skill to operate in the settingthereof, to the end that the knees or head blocks of a saw mill carriage may be expeditiously adjusted in required spaced relation to the saw.

A further object is the provision of,a:construction wherein the knees or headblocks of a saw carriage may be expeditiously and accurately adjusted so that the saw will cut a log or cant to any of the usualcommercial dimensions, and this withoutrequiring any but: the ordinary manipulation of the .adjusting screws of the head blocks or knees.

The above andother objects are accom plished, by instrumentalities pointed out in the following specification.

The invention is clearly defined in the claims.

A satisfactory embodiment ofthe invention is illustrated in the accompanying drawings forming part of the specification and in which a Figure -1 is a side elevation showing a portion of a sawmill carriageand thedevice of this invention in use;.

:Figure 2 is an enlarged detail side elevation of .the complete invention with parts thereof broken away to disclose-the construction .and relation of other parts Figure 3 is a plan of Figure 2 onaslightly reduced scale;

Figure 4 .is-a detail;cross-section on the line 4-'4iof.-Figure 3,.looking in the directionof the arrows;

:Figure 5 is a sectional plan on the line 55 of Figure 4, looking in the direction of the arrows; the parts shown, however, being on a slightly. enlarged scale with-respect to the scale of Figure 4; I I Figure 6 is a sectional detail taken through the recessed portion oftheplate, showing the stop and thetoothed wheel in side elevation andjthe frameinendelevation; and g I v Figure 7' is a-view similar to F igure-G, except that the frameis shown in perspective. i

In the drawings,"5 indicates the upright stop shaft which-is journaled inibearings 7 1926. Serial No. 98,249.

of an upright'frame 8 disposed upon the saw carriage 9, the said shaft having at its lower .enda bevel gear 10 which mesheswith a bevel gear 11 rigidly secured on a shaft 12 which forms part of the mechanism for as being secured toupright frame 8. Plate 14 may have any desired peripheral contour and, in the present instance, I have shown it as being substantially circular and provided with avertical open ended recess 15 in which .a two-endedstop 16 is arranged to oscillateor rock in a vertical plane. 17 is a rockshaft with its op'posite end portions journaled in bearings 18and 19 depending from thelower face of plate 1.4,.and suitably rigidlysecured thereto as by bolts 20.

An operating handle 21 is rigidly secured to a projecting end portion of rock shaft .17, so that the .stop16 may be rocked or turned in either direction when the handle 21 is manipulated; The upper end of the stop 16 is disposed substantially in a plane with the upper face of the plate 14 and nicely fits within the upper end 'of recess 15 so that .-when handle 21 is turned in one direction, one cornerofthe stopwill be projected above the upper face of the plate, and the opposite corner moved downwardly, .the

said oppositecorner, however, isprojectable abovethe surface of theplate whenthe handle is turned in the vrequired direction.

' 22 is a toothed wheel keyed or otherwise fixedlysecured toshaft aand located above and in spacedrelation-to .plate 14. Inthe construction illustrated, it is assumed that the pitch of the threads ofthe adjusting screws .23 is suchthat these screws willadjust the head blocks .for a dist-anceof approximately four inches in'eaeh rotation of the gearing connection 24 between the screws .and the shaft 5, and likewise the shaft 5 will also turn at thesame speed as the screws .23. It may be further assumed as an illustration that toothed wheel 22 is thirtieth, of an, inch" distance. of one;

IOU

A horizontally disposed swinging frame embraces toothed wheel 22 and has its upper side 26 and lower side 27 provided at their inner end portions with alining openings for the loose reception of the upper end portion of shaft 5. A horizontally disposed pawl 28 is slidably fitted between the sides 26 and 27 and is actuated by-a link 29 to engage and disengage the toothed wheel 22.

In the construction shown the inner end of the pawl conforms to the curvature of the wheel and is provided with a plurality of teeth 30 adapted to interfit with the teeth of the wheel 22. The link is disposed with one end'in a recess 31 in the outer end of the pawl and supported therein by a pin 32. The outer end of the link is connected to a pin 33 extending between a pair of disks 34 which are eceentrically secured to a shaft 35 which disposed transversely of the outer end portion of the frame and journaled in the opposite side walls 36 there of. An operating handle 3. is secured to a projecting end portion of shaft 35 and operates when rocked to oscillate the link 29 and thereby engage and disengage the pawl from the wheel 22. It will be noted that the pins 33 and 35 are disposed diametrically opposite and that when pawl 28 is engaged with wheel 22, pins 32, 33 and 35 are dead centered so as to provide against accidental displacement of pawl 28 from the wheel 22.

The marginal portion of the upper face of plate 1 1 is provided with a circular scale of inches, the scale being equally divided into four main divisions representing from one to four inches, and each division is subdivided into sixteenths. Any suitable means may be provided for indicating the divisions of the scale, such as a pointer 38 carried by the frame 25. It will be noted that the frame 25 extends radially of plate 1 1 and beyond stop 16 so that one of the ends of the stop projecting above the surface of the plate extends into the path of movement of the frame and thereby operates to limit movement of the frame in one direction beyond the zero point of the scale.

A spring pressed latch bolt 39 is disposed in a transverse recess in the plate and is yieldingly held within either of a pair of lateral detents 40 in stop 16. A compression spring A1 is confined between the head of the latchbolt and a plug 42 screwed into the recess. The latch bolt operates to hold the stop against accidental turning movement'when either of the corners of the stop is projected above the upper face of the plate 14.

In the use of the device and assuming that a board of two inches in thickness is to be sawed from a log and with the pointer of the frame arranged at zero, the operator proceeds by first operating handle 37 to disengage the pawl 28 from the toothed wheel. When this is done the operator proceeds to swing or turn the frame until the pointer thereof coincides with the division on the scale indicating two inches after which handle 37 is moved to efiect engagement between the pawl 28 and wheel 22. At this time stop 16 i's'adjuste'd so that an end thereof will intercept theframe when thesame returns to its initial position. When the attendant operates the adjusting mechanism of the screws 23, the movement of the screws is transmitted to the frame 25 through the gear wheel 22, and the frame is turned to its initial position, whereupon its movement is intercepted by the stop 16. At this time the screws 23 have moved the knees 13 for a distance of two inches. It will be obvious that a procedure corresponding to that just described is followed when setting the mechframe to complete one revolution of the scale and would continue the turning movement of the frame until the indicator coincided with the two inch division of the scale.

It is to be noted that when the frame 25 is manipulated to move in a contra-clockwise direction away from the projecting end of the stop 16, the said frame operates to depress the said projecting end by overriding the same in returning to initial position after moving completely around the scale, so that when the frame is moved in a clockwise direction by the action of'the setting mechanism, it operates in passing over the stop to depress the corner on the left thereof, whereby the corner'on the right is raised and in position to intercept the frame when the same returns to its initial zero position. In this way the stop operates automatically to intercept the frame on all cuts to be made between one and eight inches. The frame 25 is enabled to ride over the stop 16 after a complete revolution of the latter on the shaft 5, because the stop 16 is wider than the frame, and because its upper edge'is concave v Although we have shown the device of the present invention operable automatical- 1y to regulate cuts from one to eight inches inclusive, nevertheless, the parts may be so proportioned with respect to any of the pre vailing constructions insaw mill carriages as to readily operate with these.

Although we have shown and described understood that the same is susceptible of one embodiment'vof our invention, it is to be Y shaft, a radially disposed frame rotatably mounted on the shaft and adapted to be moved manually in one direction, means carried 'by the frame and adjustable-into engagement with the toothed wheel for causing the frame to move with the stop Shaft in an opposite direction, an oscillating stop connected to the plate and having two oppositely disposed portions respectively adapt-v ed to be alternately projected into the path of movement of the frame, one of said portions being adapted to intercept the frame when the same is moved angularly in one direction and for a predetermined distance by the shaft, said portion being further adapted to yield under pressure of the frame when the same is moved manually and in another direction and for a distance or not less than 860. V

2. A set works having a stop shaft, a toothed Wheel fixedly secured to the said shaft, a stationary plate surrounding the shaft, a radially disposed frame rotatably mounted on the shaft and adapted to be moved manually in one direction, means carried by the frame and adjustable into engagement with the toothed wheel for causing the frame to move with the stop shaft in an opposite direction, a stop connected tothe plate for limited oscillating movement, said stop having two oppositely disposed portions respectively adapted to be alternately projected into the path of movement of'the frame, oneof said portions being adapted to intercept the frame when the same is moved angularly in one direction and for a predetermined distance by the shaftfsaid portion being further adapted to yield under pressure of the frame when the same is moved manually and in another direction and for a distance of not less than 360, and means for yieldingly holding the stop against return movement when the same 1s moved in one direction by the action of the frame.

3. A set works having astop shaft, a toothed Wheel fixedly secured to the said shaft, a stationary plate surrounding the shaft, a radially disposed frame rotatably mounted on the shaft and adapted to be moved manually in one direction, means carried by the frame and adjustable into engagement with the toothed wheel for causing therframe to move with the stop shaft in an opposite direction, an oscillating stop connected to the plate and having two oppositely disposed portions respectively adapted to be alternately projected into the path of movement of the frame, one of said portions being adapted to intercept the frame when the same is moved angularly in one direction and for a predetermined distance by the shaft, said portion being further adapted to yield under pressure of the frame when the same is moved manually and in another di rection and for a distance of not less than 360, the other of said portions being adapted to yield under pressure of the frame and upon return movement thereof under action of the stop shaft and after the frame has moved for not less than 360.

THOMAS CAR'MICHAEL.

JOHN E. BOWLIN. 

